Telephone or other sound receiver



May 22, 1923.

L. STElNBERGER TELEPHONE OR OTHER SOUND RECEIVER Filed Jan. 1 1921 IN VEN TOR LOU/ 5 Sfe/hbe/yer" downwardly from the "underside t t an ldav. 22, test.

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- Application filed January 21, 1921. Serial No; 438,851.

To, all whom z't may concern:

Be it lmown that 1, Louis S'rnmenaenn,

a citizen'ol the United States, and a resident of the borough of Brooklyn, city and State of New York, have invented certain new and useiul Improvements in Telephone or Other Sound Receiversmfwhich thelollowing is a specification.

My invention relates to sound receivers particularly adapted for use in telephone systems or in talking machines whereby the equalization of air pressure may be efiected on both sides of the diaphragm.

One of the objectsof the invention is to provide a sound receiver so constructed that the diaphragm is held in place by clamping nieans efiective throughout its periphery and means being also provided for permittingfree passage of air from the upper to the lower side of the diaphragm around the edge thereof thereby equalizing the air pressure thereon and ermitting more edective operation of the iaphragm.

@ther objects will appear from the subjoined specification and claims.

In the drawings:

Fig. l is a view partly in section and partly in elevation of a telephone sound receiver embodying my invention.

ll i 2 is a horlzontal section of the lower pomon or" the sound receiver on line 2-2 of l, T

3 is a view similar to Fig. l of a modig lied structure embodying my invention.

1n the drawings, 5 designates the exterior.

casing of a telephone receiver, the samehe ing made either of electrose or hard rubber or of a suitable non-metallic insulating material hevin an open end across which the vibratory diaphra 6 extends and upon which it is shpported. The diaphragm is held in place lay amp/7 made oi material similar torthat oitiv'vhich the casing is made.

and havini t" readed connection therewith at. b

other so as to form when the cap is in place chamber 30 which, when the cap is mounted upon and secured to the lower portion of the sound receiver, extends from a point above the dla-phra to a point below the same and surroun s the edge thereof. The 60 lower portion of the flange 12 is screw threaded on the inner side so as to cage with screwthreads on the outer surface of the casing of the receiver at 8 to ed'ect an engagement therewith to hold the cap and @5 diaphragm in place.

The lower portion of. the receiver casing 5 has projecting upwardly therefrom a flange 13 upon which the diaphra 6 rests and against which the dia hire is clainped m loy the under side of the ang e-11 oi the ca when the cap is screwed into place. t Wlll thus be seen that the diaphragm is rigidly and permanently held in place around its periphery by being clamped by the 7d flanges 11 of the cap and 13 of the lower portion of the receiver so there may he no danger of the diaphra buckling in any .WHZ.

in and sound communication -hetween w the chamber 9 and the chamber is efiectcd by means of a plurality of conduits extending through the flange ll.,'and likewise communication between the chamber 10 and the chamber 20 is edected ey a plurality of Q5 conduits 40 extending through the flange 13. I This arrangement of air conduits is edective to provide air communication from the chamber Qthrough the chammr 2-0 to "the chamber 10, and consequently provides for M an'c uality of air pressure on both sides of the iaphragm.

j' The structure illustrated in Fig. 3 isiiundarnentally the same as the structure shown in Fig. l, but in the structure of Fig 3 I have provided another specific form. of cap with an independent coupling to secure the cap in place to the lower portion '5 oi the a sound receiver and thus secure the phragm between-the flange 11 of the-cap and the flange 13 of the sound receiver. The lower portion of the soundoreceiver shown in lfig. 3 is exactly the same shape and tormetrones the lower portion of the sound re ceiver of Fig. l, the cap however, diders in that the downwardlycrojectingflangel2 of Fig.1 is omitted an in lieu thereof there is'prdvided a horizontally projecting flange 12' extending outwardly from the cap.

coupling member which may be either ml rnade of metal or insulating material is cylindrical in shepe' and hale a horizontally dis posed flange 51 projecting inwardly at one end to engage the upper surface of t flange 12' and is screwthreaded at 52 at the lower end to engage the screwthreads 8' which are formed on the outer upper portion of the telephone receiver 5, and thus hold the cap y of the diaphragm adjacent its outer edge,

then the coupling member 50 is screwed down into place so that the flange 51 bears against the flange 12' of the cap 7 and holds the cap firmly-down upon the diaphragm, thus clamping the diaphragm in place, as clearly shown. The cap 7, diaphragm. 6, lower member being assembled and clamped in place by the coupling 50, it will be noted that the shape of the elements are such that a chamber will be formed by the flanges 11 and,13 and the coupling member 50, which chamber extends around the edge of the diaphragm and communicates with the chamber 9 by means of a plurality oi conduits extending through the flange it and with the chamber 10 underneath the diaphragm by means of a plurality of conduits t0 which extend through the flange'lta.

Elie magnet elements, in the interest of clearness, are not shown, and it is deemed sudicient only to say that they may be of any suitable form as my invention is in no way concerned with the details of the magnet whereby the diaphragm is caused to vibrate.

The construction above described is simple and efiective for providing a uniform clamping meansfor the diaphragm and for also providing equal air pressure on both sides of the diaphragm and thereby causing the diaphragm to be more sensible to the sound vibrations and to permit more eflective operation thereof,

he changes of construction could be made within the scope of my invention, it is in inseam tended that all matter contained in the above description or shown in the accompanying drawings shall-be interpretedas illustrative and not in a'limiting sense.

Having thus described my invention What I claim as new and desire to secure by Letters Patent is: 1. A telephone receiver comprising a casing with a longitudinally extending perforated annular flange formed at one end there- I of, a diaphragm seated on said flange, and a cap secured to said casing having a perforated annular flange engaging the opposite side of said diaphragm and adapted to exert an even pressure on the outer peripheral margin of the diaphragm, the said perforations leading into an annular chamber ing longitudinally and an outer screw threaded portion, a cap having an outer flange engaging with said screwthreads and an inner flange spaced away from said outer flange to form an annular chamber and a diaphragm whose peripheral margin is held between said inner flanges, each ot the said.

inner flanges having openings therethrough communicating with said annular chamber.

In witness whereof, l have hereunto set my hand at the borough of Manhattan, city and State of New York, this 14: day of- January, 1921.

LQUIS STEINBERGERQ 

